2 * Copyright (C) 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 static struct rtadvd_timer timer_head;
45 #define MILLION 1000000
47 static struct timeval tm_max = {0x7fffffff, 0x7fffffff};
52 memset(&timer_head, 0, sizeof(timer_head));
54 timer_head.next = timer_head.prev = &timer_head;
55 timer_head.tm = tm_max;
59 rtadvd_add_timer(void (*timeout) __P((void *)),
60 void (*update) __P((void *, struct timeval *)),
61 void *timeodata, void *updatedata)
63 struct rtadvd_timer *newtimer;
65 if ((newtimer = malloc(sizeof(*newtimer))) == NULL) {
67 "<%s> can't allocate memory", __FUNCTION__);
71 memset(newtimer, 0, sizeof(*newtimer));
73 if (timeout == NULL) {
75 "<%s> timeout function unspecfied", __FUNCTION__);
80 "<%s> update function unspecfied", __FUNCTION__);
83 newtimer->expire = timeout;
84 newtimer->update = update;
85 newtimer->expire_data = timeodata;
86 newtimer->update_data = updatedata;
87 newtimer->tm = tm_max;
90 insque(newtimer, &timer_head);
96 rtadvd_set_timer(struct timeval *tm, struct rtadvd_timer *timer)
100 /* reset the timer */
101 gettimeofday(&now, NULL);
103 TIMEVAL_ADD(&now, tm, &timer->tm);
105 /* update the next expiration time */
106 if (TIMEVAL_LT(timer->tm, timer_head.tm))
107 timer_head.tm = timer->tm;
113 * Check expiration for each timer. If a timer is expired,
114 * call the expire function for the timer and update the timer.
115 * Return the next interval for select() call.
120 static struct timeval returnval;
122 struct rtadvd_timer *tm = timer_head.next;
124 gettimeofday(&now, NULL);
126 timer_head.tm = tm_max;
128 while(tm != &timer_head) {
129 if (TIMEVAL_LEQ(tm->tm, now)) {
130 (*tm->expire)(tm->expire_data);
131 (*tm->update)(tm->update_data, &tm->tm);
132 TIMEVAL_ADD(&tm->tm, &now, &tm->tm);
135 if (TIMEVAL_LT(tm->tm, timer_head.tm))
136 timer_head.tm = tm->tm;
141 if (TIMEVAL_LT(timer_head.tm, now)) {
142 /* this may occur when the interval is too small */
143 returnval.tv_sec = returnval.tv_usec = 0;
146 TIMEVAL_SUB(&timer_head.tm, &now, &returnval);
151 rtadvd_timer_rest(struct rtadvd_timer *timer)
153 static struct timeval returnval, now;
155 gettimeofday(&now, NULL);
156 if (TIMEVAL_LEQ(timer->tm, now)) {
158 "<%s> a timer must be expired, but not yet",
160 returnval.tv_sec = returnval.tv_usec = 0;
163 TIMEVAL_SUB(&timer->tm, &now, &returnval);
170 TIMEVAL_ADD(struct timeval *a, struct timeval *b, struct timeval *result)
174 if ((l = a->tv_usec + b->tv_usec) < MILLION) {
176 result->tv_sec = a->tv_sec + b->tv_sec;
179 result->tv_usec = l - MILLION;
180 result->tv_sec = a->tv_sec + b->tv_sec + 1;
186 * XXX: this function assumes that a >= b.
189 TIMEVAL_SUB(struct timeval *a, struct timeval *b, struct timeval *result)
193 if ((l = a->tv_usec - b->tv_usec) >= 0) {
195 result->tv_sec = a->tv_sec - b->tv_sec;
198 result->tv_usec = MILLION + l;
199 result->tv_sec = a->tv_sec - b->tv_sec - 1;